samedi 18 juillet 2009

How to make a magic tap




What you will need : A brass garden tap. We used one with a 2cm (3/4") diameter size.
A small submersible electric water pump which pumps at between 600L and 800L per hour.
Acrylic or polycarbonate clear tube (the latter is preferred) with an outside diameter of about 2cm (3/4"), to fit tap size.
Tube stop - a small piece of plastic or silicone tube or hose which acts as a collar on the tubing to stop the tube from sliding into the pump.
Pot, vase, bowl or bottle to hide the pump and to catch and recirculate the water.
Bondcrete or sealant. Used to waterproof and seal the container if porous, such as a terracotta pot.
River pebbles to fill in the pot and cover the electrical cord of the pump. If the container is large, use a smaller plastic flower pot. Cut a hole in the bottom to allow the plastic tube to pass through and fill the pot with river pebbles.
What to do (see diagram):
Cut the acrylic or polycarbonate tube to length of about 60cm (2'). The length depends on the size and height of the container.
Drill two 6.5mm (1/4") holes in the tube all the way through so that there are four holes at the top of the tube. Make the holes as big as possible without breaking the top of the tube.
Insert the tube into the pump. The end of the tube with the holes goes at the top. Put the collar or stop on the bottom end of the tube to prevent the tube from sliding right down into the pump.
Drill a larger hole in the tap, if necessary, to fit the plastic tube.
Set the pump with tube coming out the top, in the pot or test bowl. (The test bowl is simply a bowl of water to test that the pump, tube and tap are working).
Drill a hole in the pot or container to allow the cord to exit or simply fill the pot with river pebbles to hide the cord exiting at the top of the pot. If the cord is exposed it gives the secret away.
Place the tap on the top end of the tube and check that the tap is turned off, otherwise the water will leak from the back of the tap. Check that the holes are not covered completely by the tap spout but that the water will exit the holes and hit the inside of the tap spout.
Put some water in the container.
Plug in the pump and turn it on.
Result
The water is pumped up the clear tube and spurts out the holes at the top of the tube. This hits the inside of the tap directing the flower of water back down the outside of the clear tube, creating the illusion that the tap is running.




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